They had so much ordnance that this seems likely -- but who was supplying and training them? "Boston Officials: Bombing Suspects ‘Were Going to Attack Other Individuals,’" from the Associated Press, April 21:
WASHINGTON (AP) — Investigators believe the suspects in the Boston Marathon bombing were likely planning other attacks based on the cache of weapons uncovered, the city’s police commissioner said Sunday.
Commissioner Ed Davis told CBS’ “Face the Nation” that authorities found an arsenal of homemade explosives after a gun battle between police and the suspects in the Boston suburb of Watertown early Friday.
“We have reason to believe, based upon the evidence that was found at that scene – the explosions, the explosive ordnance that was unexploded and the firepower that they had – that they were going to attack other individuals,” Davis said. “That’s my belief at this point.”
One suspect, 26-year-old Tamerlan Tsarnaev, was fatally wounded in the gun battle, and his brother, 19-year-old Dzhokhar, escaped, authorities said. The two threw explosive devices at police in their getaway attempt, authorities said.
“There were over 250 rounds of extended ammunition that was found at the scene. This was a five- to 10-minute gun battle that occurred there, punctuated by loud explosions,” Davis said, adding that the explosive devices were homemade.
The scene was loaded with unexploded bombs, and authorities had to alert arriving officers to them and clear the scene, Davis said. One improvised explosive device was found in the Mercedes the brothers are accused of carjacking, he said....